The drug-cartel leader, who was recaptured by Mexican marines in February 2014, began plotting his escape almost immediately.

Reuters

A simple desk and shelf are seen in one corner of his cell.

Reuters

Here's a shot of Guzmán's bed.

Reuters

His cell had one security camera, which was located above his bed.

Reuters

The entrance to Guzmán's custom-built tunnel was perfectly located within the surveillance camera's blind spot ...

Reuters

... leading some investigators to believe that a person within the prison shared blueprints and security details with Guzmán's engineers.

Reuters

Shortly before 9 p.m. on Saturday, Guzmán got up from his bed and walked toward his shower at the far end of his cell.

Reuters

He crouched down behind a short wall that separated his shower from his toilet and sink.

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He then squeezed through the shower floor measuring 1 1/2 feet by 1 1/2 feet.

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Here's a close-up of the hole.

Reuters

Guzmán then climbed down a 32-foot ladder ...

REUTERS/Edgard Garrido

... which led to a mile-long tunnel that was 5 1/2 feet high (one inch taller than Guzmán) and 2 feet 7 inches wide.

Reuters

The secret passage was illuminated, ventilated, and equipped with a motorcycle modified to run on rails.

Reuters

Authorities believe the motorcycle was used to move dirt during the construction of the tunnel.

Reuters

And this mechanical pulley found at the far end of the passage may have been used to lift up debris from the excavation.

Reuters

The end of the tunnel led to a basement of an abandoned home. The room was full of construction materials.

Reuters

A short ladder in the corner of the room was the last leg of Guzmán's escape.

Reuters

The ladder opened up to a dirt floor of a dusty unfinished home.

Reuters

While the owner of the property is still unknown, officials believe the concrete building was uninhabited for some time. "It's totally abandoned," Mexican Attorney General Arely Gómez González told reporters.

Reuters

The nondescript abandoned site is at least half a mile away from any other building.